✨(backends) granular data backends without template pattern #488
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We simplify the base data backend interface by moving out the write and list methods. Now, data backends that implement the list and write methods should inherit from Writable and Listable classes.
We want to automatically discover backends in the data/backends sub-directories for CLI and LRS usage. We also now handle import failures gracefully, thus backends with unmet dependencies are excluded.
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Purpose
Currently, not all backends follow the base interface strictly.
This is problematic as we need to know in advance what methods a backend supports for the CLI usage.
Also, we want to automatically discover backends in the data/backends sub-directories for CLI and LRS usage and handle import failures gracefully, to exclude backends with unmet dependencies.
Proposal
BaseDataBackendinterface to allow backends to follow the base interface more strictly.The
write/listmethods are extracted in separate interfaces (Writable,Listable).Thus, by default, a backend only needs to support the
status/readandclosemethods, and its functionalitycan be extended by inheriting the
Writable/Listableinterfaces.Instead of using
BackendSettingsto discover backends we implement aget_backendsfunction to search for backends in thedata/backendssub-directories.